◆ 3504 Design concept
Better preparation of root tips to meet clinical needs
◆ 2506 Design concept
Ensure that the middle and upper parts of the root canal are fully pre-opened to adapt to various filling methods
◆ CM phase a NITI material
Adapted for use in various root canals
◆ Reduced microcracks
Gold-plated surface enhances flexural fatigue and sharpness

specification	Length	Tip shape	Color identification	Section shape	0mm	1mm		3mm	7mm		11mm	15.5mm		Rotational speed	torque
1708	16mm 19mm	conical	colourless	Convex triangle	0.17	0.25		0.41	0.73		1.05			300	3.0
1902	21mm 25mm 31mm	conical	yellow	square	0.19	0.21		0.25	0.33		0.41	0.50		350	1.5
2004	21mm 25mm 31mm	conical	yellow	Convex triangle	0.20	0.24		0.32	0.48		0.64	0.82		350	1.5
2504	21mm 25mm 31mm	conical	red	Convex triangle	0.25	0.29		0.37	0.53		0.69	0.87		350	1.5
2506	21mm 25mm 31mm	conical	Double red	Convex triangle	0.25	0.31		0.43	0.67		0.91	1.18		350	2.0
3504	21mm 25mm 31mm	conical	green	Convex triangle	0.35	0.39	0.47		0.63	0.79			0.97	350	1.5

Order of operation:

Unclog the root canal by hand with a 10-gauge stainless steel K-file.
Use open file (1708), pre-open crown square and middle upper.
Measure the working length with a 10 gauge stainless steel K file and prepare to the root tip with a 15 gauge stainless steel K file.
Machine channel file (1902) to create smooth channels.
Use 2004 (yellow), 2504 (red), 2506 (double red), 3504 (green) in turn, in the wash solution soaking, with brush method, every 1-2mm is short lift, ready to the working length.
Every time the file is changed, rinse with a flushing solution (sodium hypochlorite is recommended), and use a No. 10 stainless steel file to return the file.

Tip: 'Always' keep 1/3 of the root tip well lubricated without straining.